#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/uaccess.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/arch/regs-gpio.h>
#include <asm/hardware.h>

static struct class *firstdrv_class;
static struct class_device *firstdrv_class_dev;

volatile unsigned long *gpfcon = NULL;
volatile unsigned long *gpfdat = NULL;

static int first_drv_open(struct inode *inode,struct file *file)
{
	
	/*配置GPF456为输出*/
	*gpfcon &= ~((0x3<<(4*2))|(0x3<<(5*2))|(0x3<<(6*2)));
	*gpfcon |= ((0x1<<(4*2))|(0x1<<(5*2))|(0x1<<(6*2)));
	return 0;
}

static ssize_t first_drv_write(struct file *file,const char __user *buf,size_t count,loff_t *ppos)
{
	int val;
	copy_from_user(&val,buf,count);
	if(val==1)
	{
		/* 点灯 */
		*gpfdat &= ~((1<<4) | (1<<5) | (1<<6));
	}else{
		/* 灭灯 */
		*gpfdat |= (1<<4) | (1<<5) | (1<<6);
	}
	
	
	return 0;
}

static struct file_operations first_drv_fops = {
	.owner 	= THIS_MODULE,
	.open 	= first_drv_open,
	.write 	= first_drv_write,
};

int major;
int first_drv_init(void)
{
	major = register_chrdev(0,"first_drv",&first_drv_fops); /* 注册驱动程序 */
	
	firstdrv_class = class_create(THIS_MODULE,"firstdrv");
	firstdrv_class_dev = class_device_create(firstdrv_class,NULL,MKDEV(major,0),NULL,"xyz"); /* /dev/xyz设备节点 */
	
	gpfcon = (volatile unsigned long *)ioremap(0x56000050,16);
	gpfdat = gpfcon+1;
	
	return 0;
}

void first_drv_exit(void)
{
	unregister_chrdev(major,"first_drv");	/* 卸载驱动 */
	
	class_device_unregister(firstdrv_class_dev);
	class_destroy(firstdrv_class);
	
	iounmap(gpfcon);
	
}

/* 设置驱动的初始化函数和卸载函数 */
module_init(first_drv_init);
module_exit(first_drv_exit);

/* 驱动程序的一些信息 */
MODULE_AUTHOR("Johnny");
MODULE_VERSION("0.1.0");
MODULE_DESCRIPTION("JZ2440 LED");
MODULE_LICENSE("GPL");









